78766716 has 72 divisors (see below), whose sum is σ = 216155856. Its totient is φ = 22256640.

The previous prime is 78766693. The next prime is 78766733. The reversal of 78766716 is 61766787.

It is a happy number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56346 + ... + 57726.

Almost surely, 2^78766716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78766716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108077928).

78766716 is an abundant number, since it is smaller than the sum of its proper divisors (137389140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78766716 is a wasteful number, since it uses less digits than its factorization.

78766716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1490 counting only the distinct ones).

The product of its digits is 592704, while the sum is 48.

The square root of 78766716 is about 8875.0614645759. The cubic root of 78766716 is about 428.6612699906.

The spelling of 78766716 in words is "seventy-eight million, seven hundred sixty-six thousand, seven hundred sixteen".